63/64 as a decimal
63/64 = 0.984375 inches = 25.0031 mm.
0.984375
63/64 of an inch
Millimetres
25.0031 mm
Centimetres
2.50031 cm
Percent
98.4375%
Decimal
terminates
Where 63/64 falls at each precision, and whether the mark is the value exactly
| Rule | Nearest mark | Exact? |
|---|---|---|
| 1/16 | 1 | nearest |
| 1/32 | 1 | nearest |
| 1/64 | 63/64 | exact |
Converting 63/64 to a decimal
A fraction is a division. 63/64 = 63 ÷ 64 = 0.984375. The decimal terminates because 64 factors into 2 × 2 × 2 × 2 × 2 × 2 — only 2s and 5s, the factors of ten. Any fraction whose denominator is built from those has an exact decimal.
In metric that is 25.0031 millimetres (2.50031 cm), since one inch is exactly 25.4 mm. As a percentage of an inch it is 98.4375%.
63/64 is a real mark on a rule: it is the 63/64 mark on a 1/64 rule.
Going the other way
To turn 0.984375 back into a fraction, pick the precision you are working to and multiply. At 1/16: 0.984375 × 16 = 15.75, giving 1 after rounding to the nearest mark. At 1/32: 0.984375 × 32 = 31.5, giving 1 after rounding to the nearest mark. At 1/64: 0.984375 × 64 = 63, giving 63/64 exactly.
What is 63/64 as a decimal?
63/64 as a decimal is 0.984375. Divide the numerator by the denominator: 63 ÷ 64 = 0.984375. The division comes out exactly, with no remainder left over.
What is 0.984375 as a fraction?
0.984375 as a fraction is 63/64, in lowest terms.
How many millimetres is 63/64 of an inch?
63/64 of an inch is 25.0031 mm, or 2.50031 cm. An inch has been defined as exactly 25.4 mm since 1959, so this conversion is a definition rather than a measurement — the millimetre value is exact too.
Where is 63/64 on a tape measure?
63/64 is a real mark on a rule: it is the 63/64 mark on a 1/64 rule.